Aspect ratio calculator

Enter a width or height, pick a ratio, and get the other dimension instantly. Works with popular presets like 16:9, 4:3, and 1:1, or enter your own custom ratio.

Aspect ratio

Width (px)

Height (px)

Result

Enter a width or height above.

Runs entirely in your browser. Nothing is uploaded.

How it works

STEP 1

Pick a ratio

Choose a common preset like 16:9 or 4:5, or enter your own custom W:H ratio.

STEP 2

Enter a dimension

Type either the width or the height you already know — the other is calculated instantly.

STEP 3

Copy the result

Copy the calculated dimension or the full WxH string in one click. Stays on your device.